Electric scroll compressor

ABSTRACT

[Task] In an electric scroll compressor which includes a housing member in which a motor fixing portion and an end plate are integrated with each other, and in which a thrust load of a swing scroll is supported by the end plate, deformation of the end plate decreases. 
     [Solution] In an electric scroll compressor in which stator contact portions  61  which come into contact with a stator  41  of an electric motor  4  and stator non-contact portions  62  which do not come into contact with the stator are alternately disposed in a circumferential direction on an inner circumferential wall of a motor fixing portion  6   a,  a hole  63  is provided at a position of the end plate  6   b  corresponding to each of the stator contact portions  61  in an axial direction, and a disadvantage in which the end plate  6   b  is deformed due to the motor fixing portion  6   a  being deformed to increase the diameter, is prevented. In addition, a reinforcing rib  65  reinforcing the end plate  6   b  is provided at a position of the end plate  6   b  corresponding to each of the stator non-contact portions  62  in the axial direction, and deformation of the stator contact portion  61  influencing the end plate  6   b  via the reinforcing rib  65  is prevented.

TECHNICAL FIELD

The present invention relates to an electric scroll compressor which isused in a refrigeration cycle of a vehicular air conditioner, or thelike, and particularly, to an electric scroll compressor, in which ahousing member in which an electric motor is accommodated is configuredsuch that a motor fixing portion to which the electric motor is fixedand an end plate which supports an axial load of a swing scroll androtatably supports a drive shaft are integrally formed.

BACKGROUND ART

In the related art, for example, as an electric scroll compressor, aconfiguration described in PTL 1 below is known. The electric scrollcompressor includes a discharge housing which includes a discharge portand in which a compression portion (compression mechanism) configuredsuch that a fixing scroll member and a movable scroll member aredisposed so as to face each other is accommodated, a suction housingwhich includes a suction port, and an intermediate housing which isinterposed between the discharge housing and the suction housing and inwhich an electric motor is accommodated along with the suction housing,in which the intermediate housing is configured so as to include a motorfixing portion in which a portion of the electric motor is accommodatedand fixed, and a bearing support portion (end plate) which is integrallyformed on the discharge housing side of the motor fixing portion,supports a thrust load of a swing scroll, and supports a drive shaft viaa bearing.

CITATION LIST

Patent Literature

[PTL 1] JP-A-2000-291557

SUMMARY OF INVENTION Technical Problem

In general, since a stator of an electric motor is closely fitted so asto be fixed to a housing member, in which the electric motor isaccommodated, using pressure-fitting, shrinkage-fitting, or the like, ifa motor fixing portion is deformed such that the diameter of the motorfixing portion increases due to the close-fitting of the motor, an endplate which is integrated with the motor fixing portion is alsodeformed.

Since the end plate is a member which supports a thrust load of a swingscroll, deformation of the end plate makes management of a thrust gap orcontact surface pressure difficult, and there is a disadvantage that thedeformation influences the performance or reliability of a compressor.Accordingly, if it is not possible to prevent the deformation of themotor fixing portion due to the close-fitting of the motor, aconfiguration in which the deformation of the end plate is decreased isrequired.

The present invention is made in consideration of the above-describedcircumstances, and a main object thereof is to decrease deformation ofan end plate in an electric scroll compressor which includes a housingmember in which a motor fixing portion and an end plate are integratedwith each other, and a thrust load of a swing scroll is supported by theend plate.

Solution to Problem

In order to achieve the above-described object, there is provided anelectric scroll compressor, including: a housing member; a compressionmechanism which is accommodated in the housing member, and in which afixing scroll having a substrate and a spiral wall and a swing scrollhaving a substrate and a spiral wall mesh with each other to form acompression chamber; a drive shaft by which the swing scroll isrevolved; a rotation preventing mechanism which prevents rotation of theswing scroll; and an electric motor which is accommodated in the housingmember and rotates the drive shaft, in which the electric motor includesa rotor which is fixed to the drive shaft and a stator which excites anddrives the rotor, in the housing member, a motor fixing portion to whichthe electric motor is fixed, and an end plate which supports an axialload of the swing scroll and rotatably supports the drive shaft areintegrally formed, stator contact portions which come into contact withthe stator and stator non-contact portions which do not come intocontact with the stator are alternately disposed in a circumferentialdirection on an inner circumferential wall of the motor fixing portion,and a hole, which is formed at a position corresponding to each of thestator contact portions in an axial direction and penetrates the endplate in the axial direction, is provided on the end plate.

Accordingly, since the hole is formed at the position corresponding toeach of the stator contact portions in the axial direction, even whenthe stator contact portions come into contact with the stator and aredeformed to be widened, stress due to deformation is not easilytransmitted to the end plate because of the hole. Therefore, it ispossible to prevent a disadvantage in which the end plate is deformeddue to the motor fixing portion being deformed so as to increase thediameter.

In addition, assuming the above-described configuration, a reinforcingrib reinforcing the end plate may be provided on the end plate at aposition corresponding to each of the stator non-contact portions in theaxial direction.

In order to increase stiffness of the end plate, providing thereinforcing rib on the end plate is effective. However, if thereinforcing rib is formed at the position corresponding to the statorcontact portion in the axial direction, stress due to the deformation ofthe stator contact portion is directly transmitted to the end plate viathe reinforcing rib. Accordingly, by forming the reinforcing rib at theposition corresponding to the stator non-contact portion in the axialdirection, it is possible to prevent the deformation of the statorcontact portion from influencing the end plate via the reinforcing rib.

Herein, the hole may be a long hole which is long in a circumferentialdirection of the end plate. According to this configuration, thedeformation of the motor fixing portion (stator contact portion) is noteasily transmitted to the end plate.

In addition, the hole may be a fluid passage through which a fluid to becompressed, which is compressed in the compression chamber, flows. Inthis way, since the hole is the passage of the fluid to be compressed,it is not necessary to form a hole for preventing deformation inaddition to the hole of the fluid passage.

Moreover, in the above-described configuration, in a case in which therotation preventing mechanism includes a plurality of ring members whichare disposed in a circumferential direction and a plurality of pinswhich engage with the ring members, between the substrate of the swingscroll and the end plate, each of the ring members may be accommodatedin a recessed portion formed on the substrate of the swing scroll, andeach of the pins may be fixed to the end plate.

According to this configuration, it is possible to fix the pins to theend plate in which deformation is prevented and which has highstiffness, and it is possible to improve the performance and reliabilityof the compressor by increasing the accuracy during assembly of thepins.

Moreover, a positioning pin which positions the fixing scroll withrespect to the end plate may be disposed on the end plate, and thepositioning pin may be provided on a virtual circle including the hole.

From the viewpoint of accurately performing the positioning between theend plate and the fixing scroll using the positioning pin, preferably,the pins are provided at locations away from a shaft center if possible.Meanwhile, the influence (deformation) due to the pressure-fitting ofthe motor with respect to the end plate is decreased on the virtualcircle in which the holes are provided or the portion inside the virtualcircle. Accordingly, the most suitable disposition location of thepositioning pin at which both conditions are satisfied is the locationpositioned on the virtual circle including the hole, and if thepositioning pin is provided at this position, it is possible to preventtilting of the positioning pin and it is possible to increasepositioning accuracy.

Advantageous Effects of Invention

As described above, according to the present invention, in an electricscroll compressor including a housing member, in which a motor fixingportion to which an electric motor is fixed, and an end plate whichsupports an axial load of a swing scroll and rotatably supports a driveshaft are integrally formed, and in which stator contact portions whichcome into contact with a stator and stator non-contact portions which donot come into contact with the stator are alternately disposed in acircumferential direction on an inner circumferential wall of the motorfixing portion, a hole penetrating in an axial direction is provided ata position of the end plate corresponding to each of the stator contactportions in the axial direction. Accordingly, even in a case in whichthe stator contact portions are deformed, it is possible to decreasedeformation of the end plate, and it is possible to prevent a decreasein the performance or reliability of the compressor.

In addition, in a case in which a reinforcing rib reinforcing the endplate is formed on the end plate, since the reinforcing rib is formed atthe position corresponding to each of the stator non-contact portions inthe axial direction, it is possible to prevent the deformation of thestator contact portion from influencing the end plate via thereinforcing rib.

In addition, assuming the above-described configuration, a rotationpreventing mechanism includes a plurality of ring members which aredisposed in a circumferential direction and a plurality of pins whichengage with the ring members, between a substrate of the swing scrolland the end plate, and each of the ring members is accommodated in arecessed portion formed on the substrate of the swing scroll, and eachof the pins is fixed to the end plate. Accordingly, since the pins arefixed to the portions at which deformation is suppressed, the accuracyduring assembly of the pins increases and it is possible to improve theperformance or reliability of the compressor.

In addition, since a positioning pin which positions the fixing scrollis provided on a virtual circle including the hole of the end plate, itis possible to increase positioning accuracy while preventing tilting ofthe positioning pin.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a section view showing an electric scroll compressor accordingto the present invention.

FIG. 2A is a rear view of a swing scroll.

FIG. 2B is sectional view of a swing scroll taken along line A-A of FIG.2A.

FIG. 3A is a view showing a housing member into which an end plate isintegrated, when viewed in an axial direction from a motor fixingportion side.

FIG. 3B is a view showing a housing member into which an end plate isintegrated, when viewed in the axial direction from a compressionmechanism side.

FIG. 4 is a side sectional view showing the housing member into whichthe end plate is integrated.

FIG. 5 is a partially cut perspective view showing the housing memberinto which the end plate is integrated.

DESCRIPTION OF EMBODIMENTS

Hereinafter, an electric scroll compressor according to the presentinvention will be described with reference to the drawings.

In FIG. 1, an electric scroll compressor 1 is an electric compressorsuitable for a refrigeration cycle which has a refrigerant as a workingfluid, and in a housing 2 formed of aluminum alloy, a compressionmechanism 3 is disposed on the right side of the drawing, and anelectric motor 4 which drives the compression mechanism 3 is disposed onthe left side of the drawing. In addition, in FIG. 1, the left side ofthe drawing is referred to as a front side of the compressor 1, and theright side of the drawing is referred to as a rear side of thecompressor 1.

The housing 2 includes a compression mechanism accommodation housingmember 5 in which the compression mechanism 3 is accommodated, a motoraccommodation housing member 6 in which the electric motor 4 driving thecompression mechanism 3 is accommodated, and an inverter accommodationhousing member 7 in which an inverter device (not shown) which drivesand controls the electric motor 4 is accommodated, and the housingmembers are positioned by positioning pins (not shown) and fastened inan axial direction by fastening bolts 8 and 9.

The compression mechanism accommodation housing member 5 fixes a fixingscroll of the compression mechanism described below, and is formed in abottomed tubular shape in which a side facing the motor accommodationhousing member is opened. In the motor accommodation housing member 6, atubular motor fixing portion 6 a to which the electric motor is fixed,and an end plate 6 b are integrally formed with each other, and the endplate 6 b is provided on a side facing the compression mechanismaccommodation housing member 5 and supports an axial load of a swingscroll 22 of the compression mechanism 3 described below, and a shaftsupport portion 10 is integrally provided with the end plate 6 b. Inaddition, in the inverter accommodation housing member 7, an inverteraccommodation portion 7 a, which is formed in a tubular shape, and anend plate 7 b in which a shaft support portion 11 is integrally formedon a side facing the motor accommodation housing member 6, areintegrally provided.

In addition, a drive shaft 14 is rotatably supported by the shaftsupport portion 10 of the end plate 6 b of the motor accommodationhousing member 6 and the shaft support portion 11 of the end plate 7 bof the inverter accommodation housing member 7 via bearings 12 and 13.The inner portion of the housing 2 is divided into a compressionmechanism accommodation portion 15 a in which the compression mechanism3 is accommodated, a motor accommodation portion 15 b in which theelectric motor 4 is accommodated, and an inverter accommodation portion15 c in which the inverter device is accommodated, from the rear side bythe end plates 6 b and 7 b which are formed in the motor accommodationhousing member 6 and the inverter accommodation housing member 7.

Moreover, in this example, the inverter accommodation portion 15 c isdefined by fixing a cover 16 to the inverter accommodation housingmember 7 using a bolt (not shown) or the like.

The compression mechanism 3 is a scroll type mechanism which includes afixing scroll 21 and the swing scroll 22 which is disposed so as to facethe fixing scroll, movement in the axial direction of the fixing scroll21 with respect to the housing 2 (compression mechanism accommodationhousing member 5) is allowed, and movement in a radial direction of thefixing scroll 21 is regulated by positioning pins 23 described below.The fixing scroll 21 is configured of a disk-shaped substrate 21 a, acylindrical outer circumferential wall 21 b which is provided over theentire circumference along the outer edge of the substrate 21 a and iserected toward the front side, and a spiral wall 21 c having a spiralshape which extends toward the front side from the substrate 21 a insidethe outer circumferential wall 21 b.

Moreover, also as shown in FIGS. 2A and 2B, the swing scroll 22 isconfigured of a disk-shaped substrate 22 a and a spiral wall 22 c havinga spiral shape which is erected toward the rear side from the substrate22 a, an eccentric shaft 25, which is provided on the rear end portionof the drive shaft 14 and is eccentrically provided with respect to theshaft center of the drive shaft 14, is supported via a radial bearing 27by a fitting recessed portion 24 which is provided at the center on therear surface of the substrate 22 a, and the swing scroll 22 is providedso as to revolve about the shaft center of the drive shaft 14.

In the fixing scroll 21 and the swing scroll 22, the spiral walls 21 cand 22 c mesh with each other, and a compression chamber 26 is definedby a space which is surrounded by the substrate 21 a and the spiral wall21 c of the fixing scroll 21 and the substrate 22 a and the spiral wall22 c of the swing scroll 22.

Moreover, positions in the radial direction of the fixing scroll 21 andthe end plate 6 b of the motor accommodation housing member 6 areregulated by the positioning pins 23.

In addition, in this example, the fixing scroll 21 is directly assembledto the end plate 6 b of the motor accommodation housing member 6 and theaxial load of the swing scroll 22 is directly supported by the end plate6 b. However, an annular thrust race having a thin plate shape may beinterposed between the outer circumferential wall 21 b of the fixingscroll 21 and the end plate 6 b, the fixing scroll 21 and the end plate6 b may be abutted against each other via the thrust race, and the axialload of the swing scroll 22 may be also supported by the end plate viathe thrust race.

The shaft support portion 10 which is integrally formed with the endplate 6 b of the motor accommodation housing member 6 has a through hole10 a at the center, and in the shaft support portion 10, a bearingaccommodation portion 31 in which the bearing 12 is accommodated and aweight accommodation portion 33 in which a balance weight 32 which isrotated so as to be integrated with the drive shaft 14 is accommodatedare formed in this order from the front side farthest from the swingscroll 22.

A suction chamber 35, into which a refrigerant introduced from a suctionport 38 described below is sucked via a suction passage 45, is formedbetween the outer circumferential wall 21 b of the above-describedfixing scroll 21 and the outermost circumferential portion of the spiralwall 22 c of the swing scroll 22, and a discharge chamber 37, to whichrefrigerant gas compressed in the compression chamber 26 is dischargedvia a discharge hole 36 formed at approximately the center of the fixingscroll 21, is formed between the rear side of the fixing scroll 21 inthe housing and the rear end wall of the compression mechanismaccommodation housing member 5. The refrigerant gas which is dischargedto the discharge chamber 37 is pressure-fed to an external refrigerantcircuit via a discharge port 39.

A stator 41 and a rotor 42 configuring the electric motor 4 areaccommodated in the motor fixing portion 6 a which is formed on thefront side of the end plate 6 b of the motor accommodation housingmember 6. The stator 41 is configured of an iron core which iscylindrically formed and a coil which is wound around the iron core, andis fixed to the inner surface of the housing 2 (motor accommodationhousing member 6). In addition, the rotor 42, which is configured of amagnet rotatably accommodated inside the stator 41, is mounted so as tobe fixed to the drive shaft 14, and the rotor 42 is rotated by arotation magnetic force formed by the stator 41 so as to rotate thedrive shaft 14.

In addition, the inverter device accommodated in the inverteraccommodation housing member 7 is electrically connected to the stator41 via a terminal (an airtight terminal) attached to a through hole (notshown) formed on the end plate 7 b, and power is supplied from theinverter device to the electric motor 4.

The suction port 38, through which the refrigerant gas is sucked to themotor accommodation portion 15 b, is formed on the side surface of thehousing 2 (motor accommodation housing member 6), and the suctionpassage 45, through which the refrigerant flowing from the suction port38 into the motor accommodation portion 15 b is introduced to thesuction chamber 35, is configured via a gap between the stator 41 andthe housing 2 (motor accommodation housing member 6), holes 63 formed onthe end plate 6 b, a gap formed between the fixing scroll 21 and thehousing 2, or the like.

As shown in FIGS. 3A to 5, stator contact portions 61 which come intocontact with the stator 41 and stator non-contact portions 62 which donot come into contact with the stator are alternately formed on theinner circumferential surface of the motor accommodation housing member6 in the circumferential direction. The stator contact portions 61 andthe stator non-contact portions 62 are formed so as to extend in theaxial direction, and the stator 41 is fixed to the housing (motoraccommodation housing member 6) by tightly fitting the outercircumferential portion of the stator 41 to the stator contact portions61 by pressure-fitting, shrinkage-fitting, or the like. Accordingly, thegap between the stator 41 and the housing 2 (motor accommodation housingmember 6) configuring a portion of the suction passage 45 is formed bygaps between the inner walls of the stator non-contact portions 62 andthe outer circumferential portion of the stator 41.

In this example, six stator non-contact portions 62 and six statorcontact portions 61 are formed with intervals of approximately 60° in acenter angle in the circumferential direction, and in this example,widths of the stator contact portions 61 in the circumferentialdirection are relatively smaller than widths of the stator non-contactportions 62 in the circumferential direction (the width of each of thestator contact portions 61 is formed so as to have approximately 20°,and the width of each of the stator non-contact portions 62 is formed soas to have approximately 40° in a circumferential angle).

In addition, the holes 63 which communicate with the motor accommodationportion 15 b and the compression mechanism accommodation portion 15 aare formed on the end plate 6 b of the motor accommodation housingmember 6, and the refrigerant flowing from the suction port 38 into themotor accommodation portion 15 b is introduced into the suction chamber35 via the holes 63.

The holes 63 are formed on the outside in the radial direction from pins51 of the rotation preventing mechanism described below. The pluralityof holes 63 are formed in the circumferential direction at positionscorresponding to the stator contact portions 61 in the axial direction,that is, positions approximately overlapping with the stator contactportions 61 in the circumferential direction (positions havingapproximately the same phases), and in this example, the holes 63 areformed in long holes extending in the circumferential direction and areformed at positions (five locations) corresponding to all remainingstator contact portions except for one position corresponding to onestator contact portion.

In addition, reference numeral 64 indicates bolt holes into which thebolts 9 are inserted.

Moreover, in this example, reinforcing ribs 65, which reinforce the endplate 6 b from the shaft support portion 10 to the inner circumferentialsurface of the motor fixing portion 6 a, integrally extend in the radialdirection on the surface of the motor accommodation portion side of theend plate 6 b. The plurality of reinforcing ribs 65 are formed withapproximately equal intervals in the circumferential direction atpositions corresponding to the stator non-contact portions 62 in theaxial direction, that is, positions approximately overlapping with thestator non-contact portions 62 in the circumferential direction(positions having approximately the same phases), and in this example,the reinforcing ribs 65 are provided at six locations in thecircumferential direction in accordance with the number of the pins 51described below. Accordingly, the reinforcing ribs 65 are formed so asnot to overlap the positions of the stator contact portions 61 in thecircumferential direction (so as not to have the same phase), and stressdue to deformation of the stator contact portions 61 is not directlytransmitted to the reinforcing ribs 65.

In addition, as shown in FIG. 3B, the positioning pins 23 which positionthe fixing scroll 21 with respect to the end plate 6 b are provided on avirtual circle a including the holes 63, and the positioning pins 23 arepressure-fitted to pin attachment holes 55 formed on the end plate 6 bso as to be fixed to the end plate 6 b.

In the above-described configuration, when the rotor 42 rotates and thedrive shaft 14 rotates, in the compression mechanism 3, the swing scroll22 is driven via the eccentric shaft 25 so as to revolve.

Accordingly, the refrigerant, which is sucked from the suction port 38to the motor accommodation portion 15 b, is introduced into the suctionchamber 35 via the holes 63 of the end plate 6 b through the gapsbetween the stator non-contact portions 62 and the stator 41 around therotor or the gap between the coils of the stator 41.

Since the compression chamber 26 of the compression mechanism moveswhile the volume of the compression chamber 26 is gradually decreasedfrom the outer circumferential sides of the spiral walls 21 c and 22 cof both scrolls to the center sides by the revolution of the swingscroll 22, the refrigerant gas sucked from the suction chamber 35 to thecompression chamber 26 is compressed, and the compressed refrigerant gasis discharged to the discharge chamber 37 via the discharge hole 36formed on the substrate 21 a of the fixing scroll 21 and is sent to theexternal refrigerant circuit via the discharge port 39.

However, in the above-described electric scroll compressor 1, since arotation force is generated in the swing scroll 22 due to the rotationof the drive shaft 14, it is necessary to revolve the swing scroll 22around the shaft center of the drive shaft 14 while regulating therotation of the swing scroll 22. Accordingly, in the present compressor,the rotation preventing mechanism in which the pins 51 are engaged isprovided between the substrate 22 a of the swing scroll 22 and the endplate 6 b of the motor accommodation housing member 6.

In this example, for example, the rotation preventing mechanism, inwhich the pins 51 are engaged, adopts a pin and ring coupling, and isconfigured of the plurality of pins 51 which are disposed in thecircumferential direction, a plurality of ring members 52 which engagewith the pins 51, and a plurality of cylindrical recessed portions 53 inwhich the ring members 52 are accommodated.

As shown in FIGS. 1, 2A and 2B, the cylindrical recessed portions 53 areconfigured so as to form recesses having circular cross-sections on therear surface of the substrate 22 a of the swing scroll 22, and areformed with equal intervals (in this example, an interval of 60°) aroundthe fitting recessed portion 24 of the swing scroll 22. Each of the ringmembers 52 is formed of iron and has a ring shape, and has a smallerouter diameter than an inner diameter of each of the cylindricalrecessed portions 53 so as to be loosely fitted to the cylindricalrecessed portion 53. A thickness of the ring member 52 in the axialdirection is substantially the same as a width of the cylindricalrecessed portion 53 in the axial direction, or is smaller than the widthof the cylindrical recessed portion 53.

Each of the pins 51 is formed of iron and has a columnar shape, and isformed so as to have a smaller outer diameter than the inner diameter ofthe ring member 52. The pins 51 are fixed with equal intervals aroundthe weight accommodation portion 33 of the end plate 6 b of the motoraccommodation housing member 6 in accordance with the positions of thecylindrical recessed portions 53. In this example, the pins 51 arepressure-fitted to pin attachment holes 54 formed on the end plate 6 bso as to be fixed to the end plate 6 b, and are fixed to the rearsurface of the portions on which the reinforcing ribs 65 of the endplate 6 b are formed.

Accordingly, even when the rotation force is generated in the swingscroll 22 due to the rotation of the drive shaft 14, the pins 51 fixedto the end plate 6 b come into contact with the inner circumferentialsurfaces of the ring members 52, the pins 51 engage with the cylindricalrecessed portions 53 via the ring members, and the movement of the swingscroll is regulated. Therefore, in the swing scroll 22, only therevolution of the swing scroll 22 with respect to the shaft center ofthe drive shaft 14 is admitted while the rotation of the swing scroll 22is regulated.

In addition, in the above-described configuration in which the pin andring coupling is used as the rotation preventing mechanism, since thecylindrical recessed portions are formed on the substrate of the swingscroll, it is possible to decrease weight of the swing scroll 22 whichis a movable member, and it is possible to improve drivability of theswing scroll 22. In addition, since the pins 51 are pressure-fitted andfixed to the end plate 6 b of the motor accommodation housing member 6which is a fixing member having higher stiffness than that of thesubstrate 22 a of the swing scroll 22, deformation of the end plate 6 bis little generated during pressure-fitting of the pins 51. Moreover,even in the case in which the pins 51 engage with the cylindricalrecessed portions 53 via the ring members 52 and receive the radialload, the locations of the cylindrical recessed portions 53 to which thepins 51 are pressure-fitted are not deformed by the radial load, and itis possible to increase accuracy during assembly of the pins 51 (it ispossible to prevent tilting of the pins).

In addition, in the above-described configuration, since the holes 63are formed on the outside in the radial direction from the locations ofthe pins 51 fixed to the end plate 6 b, even in a case where the motorfixing portion 6 a is pressed and widened when the stator 41 of theelectric motor is tightly fitted to the motor fixing portion 6 a (thestator contact portions 61) of the motor accommodation housing member 6,deformation of the end plate 6 b is prevented by the holes 63, and it ispossible to prevent deformation at the locations of the fixed pins 51.Particularly, in the present embodiment, in the case where the holes 63formed on the end plate 6 b are formed in the long holes extending inthe circumferential direction and are formed at the positionscorresponding to the stator contact portions 61 in the axial direction,it is possible to reliably prevent transmission of stress from thestator contact portions 61, at which deformation of the motor fixingportion 6 a is most significantly generated, by the holes, and it ispossible to more effectively prevent deformation of the end plate 6 b(deformation at the locations of the fixed pins).

Moreover, in the above-described configuration, since the pins 51 arefixed to the portions at which the reinforcing ribs 65 provided on theend plate 6 b are formed, the pins 51 are fixed to the locations havinghigher stiffness in the end plate 6 b, and it is more reliably preventthe deformation at the locations to which the pins 51 arepressure-fitted when the pins 51 are pressure-fitted so as to be fixedor when the pins 51 receive the radial load.

Moreover, since the reinforcing ribs 65 are formed at the positionscorresponding to the stator non-contact portions 62 in the axialdirection, it is possible to prevent the stress due to the deformationof the stator contact portions 61 from being transmitted to the endplate 6 b via the reinforcing ribs 65.

Moreover, in the above-described configuration, since the positioningpins 23 which position the end plate 6 b and the fixing scroll 21 areprovided on the virtual circle including the holes 63, it is possible tosatisfy a demand of providing the positioning pins 23 at locations awayfrom the shaft center if possible to secure positioning accuracy betweenthe end plate 6 b and the fixing scroll 21, and a demand of suppressinginfluences (deformation) of the end plate 6 b due to thepressure-fitting (tightly fitting) of the electric motor 4 with respectto the motor accommodation housing member 6, and it is possible tosecure accuracy during assembly of the positioning pins 23 whilesecuring positioning accuracy of the fixing scroll 21.

Moreover, in the above-described configuration example, the example isexemplified in which the cylindrical recessed portions 53 engage withthe pins 51 via the ring members 52. However, in order to secure arotation prevention function, it is also possible to omit the ringmember 52, and in this case, the cylindrical recessed portions 53 maydirectly engage with the pins 52. Also in this configuration, effectssimilar to those of the above-described configuration example can beobtained.

REFERENCE SIGNS LIST

1: electric scroll compressor

2: housing

3: compression mechanism

4: electric motor

6: motor accommodation housing member

6 a: motor fixing portion

6 b: end plate

14: drive shaft

21: fixing scroll

21 a: substrate

21 c: spiral wall

22: swing scroll

22 a: substrate

22 c: spiral wall

23: positioning pin

26: compression chamber

51: pin

52: ring member

53: cylindrical recessed portion

61: stator contact portion

62: stator non-contact portion

63: hole

65: reinforcing rib

1. An electric scroll compressor, comprising: a housing member; acompression mechanism which is accommodated in the housing member , andin which a fixing scroll having a substrate and a spiral wall and aswing scroll having a substrate and a spiral wall mesh with each otherto form a compression chamber; a drive shaft by which the swing scrollis revolved; a rotation preventing mechanism which prevents rotation ofthe swing scroll; and an electric motor which is accommodated in thehousing member and rotates the drive shaft, wherein the electric motorincludes a rotor which is fixed to the drive shaft and a stator whichexcites and drives the rotor, wherein in the housing member, a motorfixing portion to which the electric motor is fixed, and an end platewhich supports an axial load of the swing scroll and rotatably supportsthe drive shaft are integrally formed, wherein stator contact portionswhich come into contact with the stator and stator non-contact portionswhich do not come into contact with the stator are alternately disposedin a circumferential direction on an inner circumferential wall of themotor fixing portion, and wherein a hole, which is formed on a positioncorresponding to each of the stator contact portions in an axialdirection and penetrates the end plate in the axial direction, isprovided on the end plate.
 2. The electric scroll compressor accordingto claim 1, wherein a reinforcing rib, which is formed on a positioncorresponding to each of the stator non-contact portions in the axialdirection and reinforces the end plate, is provided on the end plate. 3.The electric scroll compressor according to claim 2, wherein the hole isa long hole which is long in a circumferential direction of the endplate.
 4. The electric scroll compressor according to claim 3, whereinthe hole is a fluid passage through which a fluid to be compressed,which is compressed in the compression chamber, flows.
 5. The electricscroll compressor according to claim 4, wherein the rotation preventingmechanism includes a plurality of ring members which are disposed in acircumferential direction and a plurality of pins which engage with thering members, between the substrate of the swing scroll and the endplate, and wherein each of the ring members is accommodated in arecessed portion formed on the substrate of the swing scroll, and eachof the pins is fixed to the end plate.
 6. The electric scroll compressoraccording to claim 4, wherein a positioning pin which positions thefixing scroll with respect to the end plate is disposed on the endplate, and the positioning pin is provided on a virtual circle includingthe hole.
 7. The electric scroll compressor according to any one ofclaim 5, wherein a positioning pin which positions the fixing scrollwith respect to the end plate is disposed on the end plate, and thepositioning pin is provided on a virtual circle including the hole. 8.The electric scroll compressor according to claim 2, wherein the hole isa fluid passage through which a fluid to be compressed, which iscompressed in the compression chamber, flows.
 9. The electric scrollcompressor according to claim 8, wherein the rotation preventingmechanism includes a plurality of ring members which are disposed in acircumferential direction and a plurality of pins which engage with thering members, between the substrate of the swing scroll and the endplate, and wherein each of the ring members is accommodated in arecessed portion formed on the substrate of the swing scroll, and eachof the pins is fixed to the end plate.
 10. The electric scrollcompressor according to claim 8, wherein a positioning pin whichpositions the fixing scroll with respect to the end plate is disposed onthe end plate, and the positioning pin is provided on a virtual circleincluding the hole.
 11. The electric scroll compressor according toclaim 1, wherein the hole is a long hole which is long in acircumferential direction of the end plate.
 12. The electric scrollcompressor according to claim 11, wherein the hole is a fluid passagethrough which a fluid to be compressed, which is compressed in thecompression chamber, flows.
 13. The electric scroll compressor accordingto claim 12, wherein the rotation preventing mechanism includes aplurality of ring members which are disposed in a circumferentialdirection and a plurality of pins which engage with the ring members,between the substrate of the swing scroll and the end plate, and whereineach of the ring members is accommodated in a recessed portion formed onthe substrate of the swing scroll, and each of the pins is fixed to theend plate.
 14. The electric scroll compressor according to claim 12,wherein a positioning pin which positions the fixing scroll with respectto the end plate is disposed on the end plate, and the positioning pinis provided on a virtual circle including the hole.
 15. The electricscroll compressor according to claim 1, wherein the hole is a fluidpassage through which a fluid to be compressed, which is compressed inthe compression chamber, flows.
 16. The electric scroll compressoraccording to claim 15, wherein the rotation preventing mechanismincludes a plurality of ring members which are disposed in acircumferential direction and a plurality of pins which engage with thering members, between the substrate of the swing scroll and the endplate, and wherein each of the ring members is accommodated in arecessed portion formed on the substrate of the swing scroll, and eachof the pins is fixed to the end plate.
 17. The electric scrollcompressor according to claim 15, wherein a positioning pin whichpositions the fixing scroll with respect to the end plate is disposed onthe end plate, and the positioning pin is provided on a virtual circleincluding the hole.
 18. The electric scroll compressor according toclaim 1, wherein the rotation preventing mechanism includes a pluralityof ring members which are disposed in a circumferential direction and aplurality of pins which engage with the ring members, between thesubstrate of the swing scroll and the end plate, and wherein each of thering members is accommodated in a recessed portion formed on thesubstrate of the swing scroll, and each of the pins is fixed to the endplate.
 19. The electric scroll compressor according to claim 1, whereina positioning pin which positions the fixing scroll with respect to theend plate is disposed on the end plate, and the positioning pin isprovided on a virtual circle including the hole.